Expansion valve



FIG. 1 is a top, front and right side perspective view of an expansion valve comprising a new, original and ornamental design;

FIG. 2 is a left view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for an expansion valve, substantially as shown and described. 